Tidal effects on sea water intrusion in unconfined aquifers

The effects of tide on seawater intrusion in unconfined aquifers and the consequences of these factors on the groundwater table was examined using a variable density numerical model. Total activity caused the seawater to intrude further inland and with a thicker interface than would have occurred wi...

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Bibliographic Details
Published in:Journal of hydrology (Amsterdam) 1999-03, Vol.216 (1-2), p.17-31
Main Authors: ATAIE-ASHTIANI, B, VOLKER, R. E, LOCKINGTON, D. A
Format: Article
Language:English
Subjects:
Aquifers
Beaches
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Fluctuation
Flux
Groundwater
Hydrology
Hydrology. Hydrogeology
Infiltration
Land
Pollution, environment geology
Pressure head
Sea water
Shape
Shorelines
Tidal cycles
Velocity
Water resources
Water tables
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Summary:The effects of tide on seawater intrusion in unconfined aquifers and the consequences of these factors on the groundwater table was examined using a variable density numerical model. Total activity caused the seawater to intrude further inland and with a thicker interface than would have occurred without tidal effects. The interface configuration was significantly altered when tidal fluctuations were included, because of changes in groundwater flow pattern and velocity near the shoreline. Where aquifer depth was much greater than tidal amplitude, sea water intrusion was much less affected by tidal activity but saline contours underwent significant change, particularly near the top of the aquifer. This was due to seawater infiltration at higher tidal levels and the effect was accentuated by a flatter beach slope. Changes in the interface configurations were small over a tidal cycle. The effects of tidal fluctuations on saline intrusion were more pronounced where the landward boundary condition was a constant head than when it was a specified flux. Salt water intrusion was found to be greater for a sloping beach than for a vertical shoreline.
ISSN:0022-1694
1879-2707
DOI:10.1016/s0022-1694(98)00275-3